Houdini 3 Aquarium includes 1 year membership at ChessOK Playing Zone. 1 Year membership at ChessOK Playing Zone provides you with full membership rights, including tournament participation, lecture creation and shared analysis of games.

Short description:

Houdini 3 is rating lists leader. Houdini 3 can be also used in Fritz and other chess programs

Analyze and annotate your games with Aquarium's advanced analysis methods

The databases millions of games in total (before October 1, 2012) that can be updated from www.chessok.com each week with 2000 new games.